Cannot execute because a node is missing the class_type property.: Node ID '#21'

[hf1511594534-byte]

Custom Node Testing

• I have tried disabling custom nodes and the issue persists (see how to disable custom nodes if you need help)

Expected Behavior

help

Actual Behavior

Cannot execute because a node is missing the class_type property.: Node ID '#21'

Steps to Reproduce

Cannot execute because a node is missing the class_type property.: Node ID '#21'

Debug Logs

# ComfyUI Error Report
## Error Details
- **Node ID:** N/A
- **Node Type:** N/A
- **Exception Type:** 提示执行失败
- **Exception Message:** Cannot execute because a node is missing the class_type property.: Node ID '#21'
## Stack Trace

Error: Prompt execution failed
    at ComfyApi.queuePrompt (http://127.0.0.1:8000/assets/index-JxNRA6lV.js:95631:13)
    at async ComfyApi.queuePrompt_with_seed (http://127.0.0.1:8000/extensions/comfyui-easy-use/assets/extensions-CjI-4J9B.js:1:185170)
    at async PromptService.api.queuePrompt (http://127.0.0.1:8000/rgthree/common/prompt_service.js:88:28)
    at async ComfyApp.queuePrompt (http://127.0.0.1:8000/assets/index-JxNRA6lV.js:302495:25)
    at async app.queuePrompt (http://127.0.0.1:8000/extensions/rgthree-comfy/rgthree.js:468:24)
    at async function (http://127.0.0.1:8000/assets/GraphView-36SjeORT.js:10008:9)
    at async http://127.0.0.1:8000/assets/index-JxNRA6lV.js:211221:14
    at async Proxy.execute (http://127.0.0.1:8000/assets/index-JxNRA6lV.js:233484:7)
    at async queuePrompt (http://127.0.0.1:8000/assets/GraphView-36SjeORT.js:7970:7)

## System Information
- **ComfyUI Version:** 0.3.56
- **Arguments:** /Applications/ComfyUI.app/Contents/Resources/ComfyUI/main.py --user-directory /Users/mr.huang/Documents/ComfyUI/user --input-directory /Users/mr.huang/Documents/ComfyUI/input --output-directory /Users/mr.huang/Documents/ComfyUI/output --front-end-root /Applications/ComfyUI.app/Contents/Resources/ComfyUI/web_custom_versions/desktop_app --base-directory /Users/mr.huang/Documents/ComfyUI --extra-model-paths-config /Users/mr.huang/Library/Application Support/ComfyUI/extra_models_config.yaml --log-stdout --listen 127.0.0.1 --port 8000
- **OS:** posix
- **Python Version:** 3.12.11 (main, Aug 18 2025, 19:02:39) [Clang 20.1.4 ]
- **Embedded Python:** false
- **PyTorch Version:** 2.9.0.dev20250831
## Devices

- **Name:** mps
  - **Type:** mps
  - **VRAM Total:** 17179869184
  - **VRAM Free:** 6172983296
  - **Torch VRAM Total:** 17179869184
  - **Torch VRAM Free:** 6172983296

## Logs

2025-09-01T14:49:03.150721 - Adding extra search path custom_nodes /Users/mr.huang/Documents/ComfyUI/custom_nodes
2025-09-01T14:49:03.150767 - Adding extra search path download_model_base /Users/mr.huang/Documents/ComfyUI/models
2025-09-01T14:49:03.150787 - Adding extra search path custom_nodes /Applications/ComfyUI.app/Contents/Resources/ComfyUI/custom_nodes
2025-09-01T14:49:03.150804 - Setting output directory to: /Users/mr.huang/Documents/ComfyUI/output
2025-09-01T14:49:03.150822 - Setting input directory to: /Users/mr.huang/Documents/ComfyUI/input
2025-09-01T14:49:03.150832 - Setting user directory to: /Users/mr.huang/Documents/ComfyUI/user
2025-09-01T14:49:03.323766 - [START] Security scan2025-09-01T14:49:03.323777 - 
2025-09-01T14:49:03.408729 - [DONE] Security scan2025-09-01T14:49:03.408752 - 
2025-09-01T14:49:03.494812 - ## ComfyUI-Manager: installing dependencies done.2025-09-01T14:49:03.494859 - 
2025-09-01T14:49:03.494886 - ** ComfyUI startup time:2025-09-01T14:49:03.494898 -  2025-09-01T14:49:03.494910 - 2025-09-01 14:49:03.4942025-09-01T14:49:03.494920 - 
2025-09-01T14:49:03.494938 - ** Platform:2025-09-01T14:49:03.494947 -  2025-09-01T14:49:03.494957 - Darwin2025-09-01T14:49:03.494966 - 
2025-09-01T14:49:03.494975 - ** Python version:2025-09-01T14:49:03.494984 -  2025-09-01T14:49:03.494993 - 3.12.11 (main, Aug 18 2025, 19:02:39) [Clang 20.1.4 ]2025-09-01T14:49:03.495001 - 
2025-09-01T14:49:03.495010 - ** Python executable:2025-09-01T14:49:03.495019 -  2025-09-01T14:49:03.495028 - /Users/mr.huang/Documents/ComfyUI/.venv/bin/python2025-09-01T14:49:03.495036 - 
2025-09-01T14:49:03.495045 - ** ComfyUI Path:2025-09-01T14:49:03.495054 -  2025-09-01T14:49:03.495062 - /Applications/ComfyUI.app/Contents/Resources/ComfyUI2025-09-01T14:49:03.495097 - 
2025-09-01T14:49:03.495121 - ** ComfyUI Base Folder Path:2025-09-01T14:49:03.495136 -  2025-09-01T14:49:03.495157 - /Applications/ComfyUI.app/Contents/Resources/ComfyUI2025-09-01T14:49:03.495169 - 
2025-09-01T14:49:03.495184 - ** User directory:2025-09-01T14:49:03.495196 -  2025-09-01T14:49:03.495206 - /Users/mr.huang/Documents/ComfyUI/user2025-09-01T14:49:03.495216 - 
2025-09-01T14:49:03.495226 - ** ComfyUI-Manager config path:2025-09-01T14:49:03.495235 -  2025-09-01T14:49:03.495244 - /Users/mr.huang/Documents/ComfyUI/user/default/ComfyUI-Manager/config.ini2025-09-01T14:49:03.495252 - 
2025-09-01T14:49:03.495264 - ** Log path:2025-09-01T14:49:03.495272 -  2025-09-01T14:49:03.495281 - /Users/mr.huang/Documents/ComfyUI/user/comfyui.log2025-09-01T14:49:03.495289 - 
2025-09-01T14:49:03.550227 - [ComfyUI-Manager] Skipped fixing the 'comfyui-frontend-package' dependency because the ComfyUI is outdated.
2025-09-01T14:49:03.550651 - 
Prestartup times for custom nodes:
2025-09-01T14:49:03.550779 -    0.4 seconds: /Applications/ComfyUI.app/Contents/Resources/ComfyUI/custom_nodes/ComfyUI-Manager
2025-09-01T14:49:03.550877 - 
2025-09-01T14:49:04.211459 - Checkpoint files will always be loaded safely.
2025-09-01T14:49:04.228206 - Total VRAM 16384 MB, total RAM 16384 MB
2025-09-01T14:49:04.228291 - pytorch version: 2.9.0.dev20250831
2025-09-01T14:49:04.229653 - Mac Version (15, 6, 1)
2025-09-01T14:49:04.229752 - Set vram state to: SHARED
2025-09-01T14:49:04.229785 - Device: mps
2025-09-01T14:49:04.934337 - Using sub quadratic optimization for attention, if you have memory or speed issues try using: --use-split-cross-attention
2025-09-01T14:49:06.347873 - Python version: 3.12.11 (main, Aug 18 2025, 19:02:39) [Clang 20.1.4 ]
2025-09-01T14:49:06.347969 - ComfyUI version: 0.3.56
2025-09-01T14:49:06.359849 - [Prompt Server] web root: /Applications/ComfyUI.app/Contents/Resources/ComfyUI/web_custom_versions/desktop_app
2025-09-01T14:49:06.967234 - [Crystools �[0;32mINFO�[0m] Crystools version: 1.27.3
2025-09-01T14:49:06.993202 - [Crystools �[0;32mINFO�[0m] Platform release: 24.6.0
2025-09-01T14:49:06.993276 - [Crystools �[0;32mINFO�[0m] JETSON: Not detected.
2025-09-01T14:49:06.999161 - [Crystools �[0;32mINFO�[0m] CPU: Apple M2 Pro - Arch: arm64 - OS: Darwin 24.6.0
2025-09-01T14:49:06.999729 - [Crystools �[0;31mERROR�[0m] Could not init pynvml (NVIDIA). NVML Shared Library Not Found
2025-09-01T14:49:06.999816 - [Crystools �[0;33mWARNING�[0m] No GPU monitoring libraries available.
2025-09-01T14:49:07.423889 - 
2025-09-01T14:49:07.423940 - �[92m[rgthree-comfy] Loaded 48 exciting nodes. 🎉�[0m2025-09-01T14:49:07.423956 - 
2025-09-01T14:49:07.423968 - 
2025-09-01T14:49:07.426384 - ### Loading: ComfyUI-Impact-Pack (V8.22.2)
2025-09-01T14:49:07.521854 - 
----------------------------------------------------------------------------
[Impact Pack] The SAM2 functionality is unavailable because the `facebook/sam2` dependency is not installed.

Installation command:
/Users/mr.huang/Documents/ComfyUI/.venv/bin/python -m pip install git+https://github.com/facebookresearch/sam2
----------------------------------------------------------------------------

2025-09-01T14:49:07.617024 - 
----------------------------------------------------------------------------
[Impact Pack] The SAM2 functionality is unavailable because the `facebook/sam2` dependency is not installed.

Installation command:
/Users/mr.huang/Documents/ComfyUI/.venv/bin/python -m pip install git+https://github.com/facebookresearch/sam2
----------------------------------------------------------------------------

2025-09-01T14:49:07.627433 - [Impact Pack] Wildcards loading done.
2025-09-01T14:49:07.633907 - ### Loading: ComfyUI-Impact-Subpack (V1.3.5)
2025-09-01T14:49:07.635164 - [Impact Pack/Subpack] Using folder_paths to determine whitelist path: /Users/mr.huang/Documents/ComfyUI/user/default/ComfyUI-Impact-Subpack/model-whitelist.txt
2025-09-01T14:49:07.635240 - [Impact Pack/Subpack] Ensured whitelist directory exists: /Users/mr.huang/Documents/ComfyUI/user/default/ComfyUI-Impact-Subpack
2025-09-01T14:49:07.635408 - [Impact Pack/Subpack] Loaded 0 model(s) from whitelist: /Users/mr.huang/Documents/ComfyUI/user/default/ComfyUI-Impact-Subpack/model-whitelist.txt
2025-09-01T14:49:07.673372 - [Impact Subpack] ultralytics_bbox: /Users/mr.huang/Documents/ComfyUI/models/ultralytics/bbox
2025-09-01T14:49:07.673445 - [Impact Subpack] ultralytics_segm: /Users/mr.huang/Documents/ComfyUI/models/ultralytics/segm
2025-09-01T14:49:07.673481 - [Impact Subpack] ultralytics_bbox: /Users/mr.huang/Documents/ComfyUI/models/ultralytics/bbox
2025-09-01T14:49:07.673503 - [Impact Subpack] ultralytics_segm: /Users/mr.huang/Documents/ComfyUI/models/ultralytics/segm
2025-09-01T14:49:08.604469 - �[34m[ComfyUI-Easy-Use] server: �[0mv1.3.3 �[92mLoaded�[0m2025-09-01T14:49:08.604498 - 
2025-09-01T14:49:08.604513 - �[34m[ComfyUI-Easy-Use] web root: �[0m/Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui-easy-use/web_version/v2 �[92mLoaded�[0m2025-09-01T14:49:08.604524 - 
2025-09-01T14:49:08.619271 - Traceback (most recent call last):
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/nodes.py", line 2129, in load_custom_node
    module_spec.loader.exec_module(module)
  File "<frozen importlib._bootstrap_external>", line 999, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui_layerstyle/__init__.py", line 63, in <module>
    imported_module = importlib.import_module(".py.{}".format(name), __name__)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/mr.huang/.local/share/uv/python/cpython-3.12.11-macos-aarch64-none/lib/python3.12/importlib/__init__.py", line 90, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 999, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui_layerstyle/py/film_post.py", line 1, in <module>
    from .imagefunc import *
  File "/Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui_layerstyle/py/imagefunc.py", line 37, in <module>
    from .blendmodes import *
  File "/Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui_layerstyle/py/blendmodes.py", line 10, in <module>
    from blend_modes import difference, normal, screen, soft_light, lighten_only, dodge, \
ModuleNotFoundError: No module named 'blend_modes'

2025-09-01T14:49:08.619440 - Cannot import /Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui_layerstyle module for custom nodes: No module named 'blend_modes'
2025-09-01T14:49:08.621318 - Traceback (most recent call last):
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/nodes.py", line 2129, in load_custom_node
    module_spec.loader.exec_module(module)
  File "<frozen importlib._bootstrap_external>", line 999, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui-sam2/__init__.py", line 1, in <module>
    from .node import SAM2ModelLoader, GroundingDinoModelLoader, GroundingDinoSAM2Segment, InvertMask, IsMaskEmptyNode
  File "/Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui-sam2/node.py", line 15, in <module>
    from sam2.build_sam import build_sam2
ModuleNotFoundError: No module named 'sam2.build_sam'

2025-09-01T14:49:08.621388 - Cannot import /Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui-sam2 module for custom nodes: No module named 'sam2.build_sam'
2025-09-01T14:49:09.851192 - Traceback (most recent call last):
  File "/Applications/ComfyUI.app/Contents/Resources/ComfyUI/nodes.py", line 2129, in load_custom_node
    module_spec.loader.exec_module(module)
  File "<frozen importlib._bootstrap_external>", line 999, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui_sunxAI_facetools/__init__.py", line 1, in <module>
    from .nodes import *
  File "/Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui_sunxAI_facetools/nodes.py", line 12, in <module>
    from .utils import *
  File "/Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui_sunxAI_facetools/utils.py", line 6, in <module>
    import mediapipe as mp
ModuleNotFoundError: No module named 'mediapipe'

2025-09-01T14:49:09.851330 - Cannot import /Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui_sunxAI_facetools module for custom nodes: No module named 'mediapipe'
2025-09-01T14:49:10.224437 - �[34mWAS Node Suite: �[0mOpenCV Python FFMPEG support is enabled�[0m2025-09-01T14:49:10.224512 - 
2025-09-01T14:49:10.224547 - �[34mWAS Node Suite �[93mWarning: �[0m`ffmpeg_bin_path` is not set in `/Users/mr.huang/Documents/ComfyUI/custom_nodes/was-ns/was_suite_config.json` config file. Will attempt to use system ffmpeg binaries if available.�[0m2025-09-01T14:49:10.224559 - 
2025-09-01T14:49:10.435641 - �[34mWAS Node Suite: �[0mFinished.�[0m �[32mLoaded�[0m �[0m220�[0m �[32mnodes successfully.�[0m2025-09-01T14:49:10.435689 - 
2025-09-01T14:49:10.435736 - 
	�[3m�[93m"Don't be pushed around by the fears in your mind. Be led by the dreams in your heart."�[0m�[3m - Roy T. Bennett�[0m
2025-09-01T14:49:10.435747 - 
2025-09-01T14:49:10.442034 - ### Loading: ComfyUI-Manager (V3.36)
2025-09-01T14:49:10.442369 - [ComfyUI-Manager] network_mode: public
2025-09-01T14:49:10.442559 - ### ComfyUI Revision: UNKNOWN (The currently installed ComfyUI is not a Git repository)
2025-09-01T14:49:10.448749 - 
Import times for custom nodes:
2025-09-01T14:49:10.448862 -    0.0 seconds: /Applications/ComfyUI.app/Contents/Resources/ComfyUI/custom_nodes/websocket_image_save.py
2025-09-01T14:49:10.448975 -    0.0 seconds: /Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui-inpaint-cropandstitch
2025-09-01T14:49:10.449098 -    0.0 seconds (IMPORT FAILED): /Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui_sunxAI_facetools
2025-09-01T14:49:10.449169 -    0.0 seconds (IMPORT FAILED): /Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui-sam2
2025-09-01T14:49:10.449242 -    0.0 seconds: /Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui_essentials
2025-09-01T14:49:10.449360 -    0.0 seconds: /Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui-kjnodes
2025-09-01T14:49:10.449390 -    0.0 seconds: /Applications/ComfyUI.app/Contents/Resources/ComfyUI/custom_nodes/ComfyUI-Manager
2025-09-01T14:49:10.449413 -    0.0 seconds (IMPORT FAILED): /Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui_layerstyle
2025-09-01T14:49:10.449494 -    0.0 seconds: /Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui-impact-subpack
2025-09-01T14:49:10.449524 -    0.1 seconds: /Users/mr.huang/Documents/ComfyUI/custom_nodes/ComfyUI-Crystools
2025-09-01T14:49:10.449551 -    0.2 seconds: /Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui-impact-pack
2025-09-01T14:49:10.449606 -    0.4 seconds: /Users/mr.huang/Documents/ComfyUI/custom_nodes/rgthree-comfy
2025-09-01T14:49:10.449623 -    0.6 seconds: /Users/mr.huang/Documents/ComfyUI/custom_nodes/was-ns
2025-09-01T14:49:10.449644 -    0.9 seconds: /Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui-easy-use
2025-09-01T14:49:10.449667 -    1.2 seconds: /Users/mr.huang/Documents/ComfyUI/custom_nodes/comfyui_instantid
2025-09-01T14:49:10.449701 - 
2025-09-01T14:49:10.668396 - Failed to initialize database. Please ensure you have installed the latest requirements. If the error persists, please report this as in future the database will be required: (sqlite3.OperationalError) unable to open database file
(Background on this error at: https://sqlalche.me/e/20/e3q8)
2025-09-01T14:49:10.675533 - Starting server

2025-09-01T14:49:10.675798 - To see the GUI go to: http://127.0.0.1:8000
2025-09-01T14:49:10.943730 - [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/model-list.json
2025-09-01T14:49:11.077743 - [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/github-stats.json
2025-09-01T14:49:11.263481 - [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/extension-node-map.json
2025-09-01T14:49:11.444985 - [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/custom-node-list.json
2025-09-01T14:49:11.660519 - [ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/alter-list.json
2025-09-01T14:49:18.760040 - FETCH ComfyRegistry Data: 5/962025-09-01T14:49:18.760256 - 
2025-09-01T14:49:25.840108 - FETCH ComfyRegistry Data: 10/962025-09-01T14:49:25.840153 - 
2025-09-01T14:49:27.100294 - got prompt
2025-09-01T14:49:27.101575 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#21'", 'extra_info': {}}
2025-09-01T14:49:32.294843 - FETCH ComfyRegistry Data: 15/962025-09-01T14:49:32.294878 - 
2025-09-01T14:49:39.221301 - FETCH ComfyRegistry Data: 20/962025-09-01T14:49:39.221363 - 
2025-09-01T14:49:40.757778 - got prompt
2025-09-01T14:49:40.759841 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#21'", 'extra_info': {}}
2025-09-01T14:49:47.696611 - FETCH ComfyRegistry Data: 25/962025-09-01T14:49:47.696745 - 
2025-09-01T14:49:54.551347 - FETCH ComfyRegistry Data: 30/962025-09-01T14:49:54.551422 - 
2025-09-01T14:50:00.915182 - FETCH ComfyRegistry Data: 35/962025-09-01T14:50:00.915279 - 
2025-09-01T14:50:08.968732 - FETCH ComfyRegistry Data: 40/962025-09-01T14:50:08.968796 - 
2025-09-01T14:50:17.343916 - FETCH ComfyRegistry Data: 45/962025-09-01T14:50:17.344039 - 
2025-09-01T14:50:24.864428 - FETCH ComfyRegistry Data: 50/962025-09-01T14:50:24.864490 - 
2025-09-01T14:50:32.586378 - FETCH ComfyRegistry Data: 55/962025-09-01T14:50:32.586596 - 
2025-09-01T14:50:41.065961 - FETCH ComfyRegistry Data: 60/962025-09-01T14:50:41.066026 - 
2025-09-01T14:50:47.781199 - FETCH ComfyRegistry Data: 65/962025-09-01T14:50:47.781394 - 
2025-09-01T14:50:54.889397 - FETCH ComfyRegistry Data: 70/962025-09-01T14:50:54.889461 - 
2025-09-01T14:50:58.235696 - got prompt
2025-09-01T14:50:58.237861 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#21'", 'extra_info': {}}
2025-09-01T14:51:02.844684 - FETCH ComfyRegistry Data: 75/962025-09-01T14:51:02.844756 - 
2025-09-01T14:51:09.829032 - FETCH ComfyRegistry Data: 80/962025-09-01T14:51:09.829161 - 
2025-09-01T14:51:17.068337 - FETCH ComfyRegistry Data: 85/962025-09-01T14:51:17.068401 - 
2025-09-01T14:51:25.225150 - FETCH ComfyRegistry Data: 90/962025-09-01T14:51:25.225257 - 
2025-09-01T14:51:31.801715 - FETCH ComfyRegistry Data: 95/962025-09-01T14:51:31.801832 - 
2025-09-01T14:51:33.462068 - FETCH ComfyRegistry Data [DONE]2025-09-01T14:51:33.462156 - 
2025-09-01T14:51:33.559590 - [ComfyUI-Manager] default cache updated: https://api.comfy.org/nodes
2025-09-01T14:51:33.568079 - FETCH DATA from: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/custom-node-list.json2025-09-01T14:51:33.568098 - 2025-09-01T14:51:34.171883 -  [DONE]2025-09-01T14:51:34.171928 - 
2025-09-01T14:51:34.206662 - [ComfyUI-Manager] All startup tasks have been completed.
2025-09-01T14:52:00.110868 - got prompt
2025-09-01T14:52:00.112746 - invalid prompt: {'type': 'invalid_prompt', 'message': 'Cannot execute because a node is missing the class_type property.', 'details': "Node ID '#21'", 'extra_info': {}}


## Attached Workflow
Please make sure that workflow does not contain any sensitive information such as API keys or passwords.

Workflow too large. Please manually upload the workflow from local file system.


## Additional Context
(Please add any additional context or steps to reproduce the error here)

Other

No response

[comfyui-wiki]

Please upload a screenshot or your workflow. There is too little information now.

But according to your description, it seems like you didn't install the custom node that needs to be installed.

[0marT0]

I am having the same issue

Is there a way to fix this?

[dzoni272727-coder]

@0marT0 did you solve the issue?

[christian-byrne]

This issue has been addressed with improved error messaging in frontend v1.39.5 (backend: #12177, frontend: Comfy-Org/ComfyUI_frontend#8511).

The cryptic "Cannot execute because a node is missing the class_type property" error now shows:

• The actual node type (e.g., KSampler, LoadImage) that is missing
• The node's custom title if you renamed it in the workflow
• A hint to install missing custom nodes via ComfyUI Manager

To get the fix: Update frontend to v1.39.5+ or use --front-end-version Comfy-Org/ComfyUI_frontend@1.39.5. ComfyUI Desktop users will receive this in the next stable release (~mid-February 2026).

If the node source shows "Unknown": This happens when the Manager is not installed or the node is not in the registry. You can enable the built-in Manager with --enable-manager, use the legacy Manager UI with --enable-manager --enable-manager-legacy-ui, or install ComfyUI-Manager as a custom node. The node ID in the error message can still help you locate it in the workflow.

Feel free to reopen this issue if the problem persists after updating. Please include your ComfyUI version, frontend version (visible in bottom-right corner), and a screenshot of the error dialog.

For general guidance see https://docs.comfy.org, or contact support@comfy.org for additional help.